Trisulfonic acid of the safranin series and process of making same.



PATENT OFFICE? mason -b1 66 non OF .qnn mma many, residing at Hiiclist bn the' Main, Ger- 6 many, have invented certainnew and useful; Im movements in Trisulfonic Acids of the So. ranin Series and Processes of Making Same, of which the following is a specificatiOILn 10 I have foundt-hat valiiabl dyestufl's can be obtained by simultaneous oxidation of a-amino-diphenyl-amin-sulfon'io acids, their omol'ogues or substitution products, with sulfonieacids of primary aminsfand lnono= sulfon'ic acids of theutertiaryamins' with 'a free ara' position lfor instancexthe alkylbenzyiianilin-sulfonl acids, which can be easily procured technically. Thus dyestufi's are obtainefd havihg. the generali formula 80d! i s; Y

wherein X stand gior hydrogen, a methyl-, alkoxyl'-, a idylamino-, or anther similar neu- The dyestufi precipitates in the form 'o f- Specification of better: Patent. gedpeeeiabe 17, 1,910. Serial 1;. 697,796.

(1., the mass is neutralized with acid, and 10 N-rHEmAim-o -mu-ANY; ASSIGNOB To FARBWERKE volum- -i.;,lmIs'r-,Em Ltmlus ar rmmmqror nocHsr-oN-TnE-mAIN, gunman, A CORPORA- Patented Jan. 23,1912- S for a sulfo group or hydrogen for a 80 methyl-, 'or eth l gr.oup;'and A for a methyl-group, et yl-group, benzyl-group, or

-benzylsulfomc acid group. .These dyestuffsv 'are distinguished by their beautiful blue tint and they possess the valuable property of 85 dyeing wool-in a bath pre )ared with a min e1'al:nci'd, and leaving white the intermixed cotton fiberstdyed at the same time,

Example If A mixture of 14 gr. of ptolyl-' -,phenylenediaminsulfonic acid, 17 gr. 40 of so ium-salt of ethyl-benzylmetanilic acid, and 5 gr. of sodium carbonate, is dissolved in -water; this solution is cooled downto 5 C;

and then a solution of 10 gr. ofsodium bichromate. 10 gr. of hydrochloric acid and 10 graof acetic acid, .addedto it, After having stirred for two hours, during which operation-the temperature has risen 120-10;

r. o chalk and 11 gr. of sodium salt of sul anilic' r. of sodiunrbichromate are added to it. his mixture is stirred for an- 'other two. hours at ordinary temperature,

then heated to boilin and as soon as its coloration does not- 0 ange any more it is filtered in the heat and the filtrate salted out. The reaction, involved may be explained by the following equation:

crystals having a brass-like luster. When" dried and ground it forms a dark powder of laddcd and the mass is stirred for two hours,

a nu-tallic luster 1.tl(l.ll dissolving in water to a blue solution. Its solution 111 concentrated sulfm-ie acid is green and turns blue on being diluted with ivntelx. It dyes \'\'ool in a bath pre mrcd with a mineral acid, blue tints.

Example II: A mixture oil. gr. of petho.\' \'phenyl p phenylenedizuninsulfonic acid, 15 gr. of ethyllienz 'lnnilinsultnnic acid and 10 gr. of: sodium carbonate is dissolved in Water, this solution is cooled down to about 5 C. and there is added to it, while stir ing, solution of 10 gr. of sodium bichromatc and 10 gr. of hydrochloric acid.

To this mixture 11) gr. of acetic acid are oxidizin somwherein X stands for a neutral group,to-

gether with the monosulfonie acids of tertiary amins so as to form indamins, and in transforming the latter into sulfonic acids of the safranin series by means of sulfonic acids of primary ammsm presence of an oxidizing agent tints, leaving the intermixed cotton fibers white. i

during which operation the temperature to 10 C. After the green solution has been neutralized with 25 giaof chalk, there are added to it first a solution of 11 gr. of

sodium salt of. sulfanilic acid and then a solution of 10 gr. of sodluin'l'iichromate; theresulting mass stirred for about another 1-2 hours, then-heated to boiling, and as soon as no further change of the coloration is perceptible, it is filtered and the filtrate saturated with common salt, whereupon the dyestufi -precipitates as a soft, resinous mass. The reaction-involved may be explained by the following equation:

n soinuno.

2. As new products, sulfonic acids of the safranin 861185, of the general formula:

'wherein fX" stands for a neutral group,

S for a monosulfonicacid of a tertiary amin combined in para position to the amino roup'with the indamin nitrogen, and R or a phenylsulfonic acid residue; which d estufis are dark-blue powders, readily solu le in water with a blue color, dissolving in concentrated sulfuricacid with a green color, which solution, when diluted with water, turns to a blue color, and dyeing wool fibers,,-

in a. bath containing a. mineral acid, blue" i r 1,015,854 i V a 8. As a new product, the dyestufl'of the formula:

I so-a I I g v N v s which dyestuif is a dark-blue powder, read- In testimon whereof, I aflix my signature 1 0 ily soluble in water with a blue color, disin presence 0 two witnesses. I solving in concentrated sulfuric acid with a I OTTO H 0 green" color, which solution, when diluted with water, turns to a blue color, and dyeing Witnesses:

wool fibers, in a bath containing a mineral JEAN GRUND, acid, blue tints, leaving the intermixed cot- CARL'GRUN1 ton fibers white. 1

Goths of this patent my be obtained for live cents each, by addressing the "commissioner of Pateiu Washington, D. 0."

It is hereby certified that in Letters Patent No. 1,015,354, granted Uahuary 23, 1912, upon the application of Otto Sohst, of Hchst-dn-the-Main, Germany, for an improvement in Trisulfonic Acid of the S afranin Series and Processes of Making Same, an error appears in the printed specification requiring correction .as

follows: Lines 20-25, formula, for

, 50.11 s soaa s =%3 mad -53= V a z v a w k Y I and that the said Letters Patent should, be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 11th day of June, A. D., 1912.

SEAL c. c. BILLINGS,

Acting Oommissioneigof Patents.

Correction in Letters Patent No.

i r 1,015,854 i V a 8. As a new product, the dyestufl'of the formula:

I so-a I I g v N v s which dyestuif is a dark-blue powder, read- In testimon whereof, I aflix my signature 1 0 ily soluble in water with a blue color, disin presence 0 two witnesses. I solving in concentrated sulfuric acid with a I OTTO H 0 green" color, which solution, when diluted with water, turns to a blue color, and dyeing Witnesses:

wool fibers, in a bath containing a mineral JEAN GRUND, acid, blue tints, leaving the intermixed cot- CARL'GRUN1 ton fibers white. 1

Goths of this patent my be obtained for live cents each, by addressing the "commissioner of Pateiu Washington, D. 0."

It is hereby certified that in Letters Patent No. 1,015,354, granted Uahuary 23, 1912, upon the application of Otto Sohst, of Hchst-dn-the-Main, Germany, for an improvement in Trisulfonic Acid of the S afranin Series and Processes of Making Same, an error appears in the printed specification requiring correction .as

follows: Lines 20-25, formula, for

, 50.11 s soaa s =%3 mad -53= V a z v a w k Y I and that the said Letters Patent should, be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 11th day of June, A. D., 1912.

SEAL c. c. BILLINGS,

Acting Oommissioneigof Patents.

Correction in Letters Patent No. 

